
<nav class="navbar navbar-expand-md ">
     <!-- Toggler/collapsibe Button -->
  <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#collapsibleNavbar">
    <span class="navbar-toggler-icon"></span>
  </button>
    <!-- Navbar links -->
  <div class="collapse navbar-collapse" id="collapsibleNavbar">
        <ul class="nav">
          <li class="nav-item dropdown">
              <a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-bs-toggle="dropdown">
                  查询仓库
              </a>
              <div class="dropdown-menu">

            <a class="dropdown-item" href="#">原料库存表</a>
            <a class="dropdown-item" href="#">Link 2</a>
            <a class="dropdown-item" href="#">Link 3</a>
          </div>

          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
          </li>
          <li class="nav-item">
            <a class="nav-link disabled" href="#">Disabled</a>
          </li>
        </ul>
  </div>
</nav>